package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.xiaoymin.knife4j.core.util.CollectionUtils;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.OrdersPageQueryDTO;
import com.sky.dto.OrdersPaymentDTO;
import com.sky.dto.OrdersSubmitDTO;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.service.ShoppingCartService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private OrderDetailMapper orderDetailMapper;

    @Autowired
    private AddressBookMapper addressBookMapper;

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatPayUtil weChatPayUtil;

    //购物车service
    @Autowired
    private ShoppingCartService shoppingCartService;

    @Override
    @Transactional
    public OrderSubmitVO submit(OrdersSubmitDTO ordersSubmitDTO) {

        //1.处理业务异常
        //a.判断地址是否为空
        AddressBook book = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (book == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        //b.查询用户的购物车
        Long userId = BaseContext.getCurrentId();
        List<ShoppingCart> cart = shoppingCartMapper.getByUserId(userId);
        if (cart == null) {
            throw new AddressBookBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //2.向订单表插入1条数据
        Orders order = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,order);
        //补充添加的
        order.setOrderTime(LocalDateTime.now());
        order.setPayStatus(Orders.UN_PAID);
        order.setStatus(Orders.PENDING_PAYMENT);
        order.setNumber(String.valueOf(System.currentTimeMillis()));//订单号
        order.setPhone(book.getPhone());
        order.setConsignee(book.getConsignee());
        order.setAddress(book.getDetail());
        order.setUserId(userId);

        orderMapper.insert(order);
        //3.向订单明细表插入n条数据
        List<OrderDetail> detailList = new ArrayList<OrderDetail>();

        for(ShoppingCart _cart : cart) {
            OrderDetail details = new OrderDetail();
            BeanUtils.copyProperties(_cart,details);
            details.setOrderId(order.getId());//设置这个订单明细对应的订单号
            detailList.add(details);
        }

        orderDetailMapper.insertBatch(detailList);

        //4.清空当前用户的购物车数据

        shoppingCartMapper.cleanByUserId(userId);
        //5.封装VO返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(order.getId())
                .orderTime(order.getOrderTime())
                .orderNumber(order.getNumber())
                .orderAmount(order.getAmount())
                .build();
        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

//        //调用微信支付接口，生成预支付交易单
//        JSONObject jsonObject = weChatPayUtil.pay(
//                ordersPaymentDTO.getOrderNumber(), //商户订单号
//                new BigDecimal(0.01), //支付金额，单位 元
//                "苍穹外卖订单", //商品描述
//                user.getOpenid() //微信用户的openid
//        );
//
//        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
//            throw new OrderBusinessException("该订单已支付");
//        }
//
//        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
//        vo.setPackageStr(jsonObject.getString("package"));


        JSONObject jsonObject = new JSONObject();
        jsonObject.put("code", "ORDERPAID");
        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        //为替代微信支付成功后的数据库订单状态更新，多定义一个方法进行修改
        Integer OrderPaidStatus = Orders.PAID; //支付状态，已支付
        Integer OrderStatus = Orders.TO_BE_CONFIRMED;  //订单状态，待接单

        //发现没有将支付时间 check_out属性赋值，所以在这里更新
        LocalDateTime check_out_time = LocalDateTime.now();

        //获取订单号码
        String orderNumber = ordersPaymentDTO.getOrderNumber();

        log.info("调用updateStatus，用于替换微信支付更新数据库状态的问题");
        orderMapper.updateStatus(OrderStatus, OrderPaidStatus, check_out_time, orderNumber);

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);
    }


    /**
     * 订单查询方法
     *
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult queryOrder(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO + 需要把订单对应的用户信息查出来
        List<OrderVO> orderVOList = getOrderVOList(page);

        //TODO 还没写完 商家端的订单查询
        return new PageResult(page.getTotal(), orderVOList);
    }

    /**
     * 用户端-历史订单查询（分页查询）
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    @Override
    public PageResult pageQuery(int pageNum, int pageSize, Integer status) {
        PageHelper.startPage(pageNum, pageSize);
        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setPage(pageNum);
        ordersPageQueryDTO.setPageSize(pageSize);
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList();

        // 查询出订单明细，并封装入OrderVO进行响应
        if (page != null && page.getTotal() > 0) {
            for (Orders orders : page) {
                Long orderId = orders.getId();// 订单id

                // 查询订单明细
                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetails);

                list.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(), list);

    }

    /**
     * 根据订单id查询详情 for[回显]
     * @param orderId
     * @return
     */
    @Override
    public OrderVO orderDetail(Long orderId) {
        OrderVO orderVO = new OrderVO();
        //从【orders】查
        Orders getOrder = orderMapper.getByOrderId(orderId);
        //从【order_detail】查
        List<OrderDetail> list = orderDetailMapper.getByOrderId(orderId);
        String dishes_String = getOrderDishesStr(getOrder);


        BeanUtils.copyProperties(getOrder,orderVO);
        orderVO.setOrderDishes(dishes_String);
        orderVO.setOrderDetailList(list);

        return orderVO;
    }

    /**
     * c-端 根据订单id取消订单
     * @param id
     */
    @Override
    public void orderCancel(Long id) {
        Orders order = orderMapper.getByOrderId(id);
        order.setStatus(Orders.CANCELLED);
        order.setCancelReason("用户主动取消！");
        order.setCancelTime(LocalDateTime.now());
        order.setDeliveryTime(null);
        order.setDeliveryStatus(null);
        orderMapper.update(order);

    }

    /**
     * c-端 再来一单
     * @param id
     * @return
     */
    @Override
    public void oneMoreOrder(Long id) {
        //重新查询出来历史订单中用户的菜品列表
        List<OrderDetail> detailList = orderDetailMapper.getByOrderId(id);
        if (!detailList.isEmpty()) {
            for (OrderDetail old : detailList) {
                //封装为ShoppingCartDTO类型
                ShoppingCartDTO shoppingCartDTO = new ShoppingCartDTO();
                BeanUtils.copyProperties(old,shoppingCartDTO);
                //调用 shoppingCartService.addShoppingCart(shoppingCartDTO) 即可
                shoppingCartService.addShoppingCart(shoppingCartDTO);
            }
        }else{
            log.error("旧订单中没有菜！");
        }
    }

    //下面是封装的功能代码****************************************************

    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        //订单的列表
        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) { // order是一条订单
                // 将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                List<OrderDetail> detailList = orderDetailMapper.getByOrderId(orders.getId());
                orderVO.setOrderDetailList(detailList);

                //order 还有一些信息要查， 如：用户名 地址
                Long userId = orders.getUserId();
                User user = userMapper.getById(userId);
                orderVO.setUserId(userId);
                orderVO.setUserName(user.getName());
                orderVO.setAddress(orders.getAddress());

                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }

}

